package com.lzc.product.dao;
import com.lzc.DBUtil;
import com.lzc.Util;
import com.lzc.product.model.Product;
import com.lzc.product.model.ShoppingCar;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

public class ProductDao {
    /*获取商品列表*/
    public List<Product> getProductList() {
        List<Product> list = new ArrayList<Product>();
        //1、获取数据库连接
        Connection conn = DBUtil.getConnection();
        //2、准备SQL
        String sql = "select * from tb_product order by create_time desc limit 10";
        //3、声明操作对象
        PreparedStatement ps = null;
        //4、声明结果集对象
        ResultSet rs = null;
        try {
//5、获取操作对象
            ps = conn.prepareStatement(sql);
//6、执行SQL并返回结果集
            rs = ps.executeQuery();
//7、解析结果集
            while (rs.next()) {
                //创建结果集
                Product product = new Product();
                product.setDescription(rs.getString("description"));
                product.setName(rs.getString("name"));
                product.setId(rs.getInt("id"));
                product.setMarket_price(rs.getDouble("market_price"));
                product.setSell_price(rs.getDouble("sell_price"));
                product.setCategory_main_id(rs.getInt("category_main_id"));
                product.setCategory_branch_id(rs.getInt("category_branch_id"));
                product.setPicture(rs.getString("picture"));

//将商品信息添加到list中
                list.add(product);
//将对象置为空，让GC尽快回收相关的内存
                product = null;
            }
        } catch (
                SQLException e) {
            throw new RuntimeException(e);
        }
        return list;
    }

    /**
     * 根据商品编号来获取商品信息
     */
    public Product getProductById(String id) {
        Connection conn = DBUtil.getConnection();
        String sql = "select * from tb_product where id = ?";
        PreparedStatement ps = null;
        ResultSet rs = null;
        try {
            ps = conn.prepareStatement(sql);
            ps.setString(1, id);
            rs = ps.executeQuery();
            if (rs.next()) {
                Product product = new Product();
                product.setDescription(rs.getString("description"));
                product.setName(rs.getString("name"));
                product.setId(rs.getInt("id"));
                product.setMarket_price(rs.getDouble("market_price"));
                product.setSell_price(rs.getDouble("sell_price"));
                product.setPicture(rs.getString("picture"));
                return product;
            }

        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {
            DBUtil.closeResource(conn, ps, rs);
        }
        return null;
    }

    /* 将商品添加到购物车 **/
    public int addCar(String customerId, String productId, String number) {
        //1.连接数据库
        Connection conn = DBUtil.getConnection();
        //2.准备SQL
        String sql = "INSERT INTO `tb_car` (`customerid`,`productid`,`number`)VALUES(?,?,?)";
        PreparedStatement ps = null;
        //3.获取操作对象
        try {
            ps = conn.prepareStatement(sql);
            ps.setString(3, number);
            ps.setString(1, customerId);
            ps.setString(2, productId);
            int result = ps.executeUpdate();
            return result;
        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {
            DBUtil.closeResource(conn, ps, null);
        }

    }

    /*将商品更新购物车的商品数量**/
    public int updateCar(String customerId, String productId, String number) {
        //1、连接数据库
        Connection conn = DBUtil.getConnection();
        //2、准备SQL
        String sql = "Update `tb_car` set `number` = ? where `customerid` = ? and `productid` = ?";
        PreparedStatement ps = null;
        //3、获取操作对象
        try {
            ps = conn.prepareStatement(sql);
            ps.setString(1, number);
            ps.setString(2, customerId);
            ps.setString(3, productId);
            int result = ps.executeUpdate();
            return result;
        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {
            DBUtil.closeResource(conn, ps, null);
        }
    }

    /*判断当前用户是否已填写此商品,如果有则返回商品目前的数量**/
    public int isExists(String customerId, String productId) {
        Connection conn = DBUtil.getConnection();
        String sql = "select * from tb_car where `customerid` = ? and `productid` = ?";
        PreparedStatement ps = null;
        ResultSet rs = null;
        try {
            ps = conn.prepareStatement(sql);
            ps.setString(1, customerId);
            ps.setString(2, productId);
            rs = ps.executeQuery();
            if (rs.next()) {
                int number = rs.getInt("number");
                return number;
            }
        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {
            DBUtil.closeResource(conn, ps, rs);
        }
        return 0;
    }

    /*根据用户编号查询这个用户加购了哪些商品，返回购物车列表**/
    public List<ShoppingCar> getShoppingCarInfo(String customerId) {
        Connection conn = DBUtil.getConnection();
        String sql = "select * from tb_car join tb_product on tb_car.productid = tb_product.id where tb_car.customerid = ?";
        PreparedStatement ps = null;
        ResultSet rs = null;
        List<ShoppingCar> list = new ArrayList<>();
        try {
            ps = conn.prepareStatement(sql);
            ps.setString(1, customerId);
            rs = ps.executeQuery();
            while (rs.next()) {
                ShoppingCar shoppingCar = new ShoppingCar();
                shoppingCar.setCustomerId(rs.getInt("customerId"));
                shoppingCar.setProductId(rs.getInt("productId"));
                shoppingCar.setDescription(rs.getString("description"));
                shoppingCar.setName(rs.getString("name"));
                shoppingCar.setPicture(rs.getString("picture"));
                shoppingCar.setNumber((rs.getInt("number")));
                shoppingCar.setSell_price(rs.getDouble("sell_price"));
                list.add(shoppingCar);
                shoppingCar = null;
            }
            return list;
        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {
            DBUtil.closeResource(conn, ps, rs);
        }
    }

    /*根据会员联系方式及购物车来生成订单**/
    public int addOrder(String phone, String total_price, List<ShoppingCar> list) {
        Connection conn = DBUtil.getConnection();
        String sql = "INSERT INTO `tb_order`(`order_id`,`mobile`,`total_price`) VALUES(?,?,?)";
        PreparedStatement ps = null;
        String orderId = Util.createOrderId();
        int n = 0;
        try {
            ps = conn.prepareStatement(sql);
            ps.setString(1, orderId);
            ps.setString(2, phone);
            ps.setString(3, total_price);
            n = ps.executeUpdate();
        } catch (SQLException e) {
            throw new RuntimeException(e);
        } finally {
            DBUtil.closeResource(conn, ps, null);
        }
        if (n > 0) {
            String sql2 = "INSERT INTO `tb_order_item`(`order_id`,`product_id`,`product_name`,`product_price`,`amount`;)" +
                    "VALUES(?,?,?,?,?)";
            PreparedStatement ps2 = null;
            try {
                ps2 = conn.prepareStatement(sql2);
                for (int i = 0; i < list.size();i++){
                    ShoppingCar shoppingCar = list.get(i);
                    ps2.setString(1, orderId);
                    ps2.setInt(2, shoppingCar.getProductId());
                    ps2.setString(3, shoppingCar.getName());
                    ps2.setDouble(4, shoppingCar.getSell_price());
                    ps2.setInt(5, shoppingCar.getNumber());
                    //添加批处理
                    ps2.addBatch();
                }
                //执行批处理
                ps2.executeBatch();
                return 1;
            } catch (SQLException e) {
                throw new RuntimeException(e);
            } finally {
                DBUtil.closeResource(conn, ps2, null);
            }
        }
        return 0;
    }
}


